Gf has a hard time getting wet recently

We never had sex (penetration), but aside from that, we are exploring our sex life. She never had any issues with getting wet when I fingered or ate her, but the last time we did it, she had a hard time getting wet, and even if she did, it would dry up quickly. She even said that she's not stimulated when I play with her boobs. She likes it when I eat her, though, but after that, the feeling is gone (she explained to me). She also told me that even when she tries to please herself, it's no longer the same; there is no tingling sensation.

It has been a month since she's been like this, and she has an irregular menstrual cycle, so we can't tell if it's the hormones.

What do you think is the problem? Or is there any problem at all?